Issue #4119 has been updated by Yui NARUSE.
Status changed from Open to Rejected
It means,
* 0xA3A0 is valid in GBK encoding scheme
* but the code point 0xA3A0 is not assgined any characers
* so the convert fails conversion
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http://redmine.ruby-lang.org/issues/show/4119
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http://redmine.ruby-lang.org